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I have been asked to design an outdoor winding staircase for a current residential construction project. The owner would like to use masonry if possible for the sidewalls and the treads & risers. The staircase will fit in a corner against the house. Since the staircase will lead up to a balcony that is about 10′ off the ground, I don’t want to try to fill the entire space under the staircase. Does anyone have experience building a staircase similar to this? I have wondered if it would be possible to use structural concrete panels to connect the two sides of the staircase and build the treads (brick or stone) on top of these panels. The fact that the staircase curves somewhat might complicate the use of these panels. I have also wondered if it would be possible to pour suspended concrete in place (with plenty of rebar) over wooden forms that could be attached to the side walls and removed after the concrete cured. Any advice would be appreciated. See the attached diagram which contains a rough diagram of the staircase. Thanks.
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Sure you can pour a suspended concrete set of stairs. I would get it engineered though. I also wouldn't rely on the balcony to support the stairs at the top. I would you use the side walls as a structural means to hold up the stairs.
*I would look into a steel fabrication shop that would make you a frame. Then you could either bolt pre-cast steps to it or form off of it for a poured in place.
*Craig,Your diagram is a blank page. Can you resubmit ?
*Sorry about the blank attachment. It appears fine when I open it locally on my PC. I have tried saving it as a JPEG. Hopefully this will work better. Thanks.